L-92 Heads...
TECH Regular
Joined: Nov 2005
Posts: 459
Likes: 0
From: Arlington, TN
One thing to think about for those that are building up a 402 or a 408 is valve location on the new heads.
One of the valves has been relocated (intake or exhaust), I'm not sure which one but just by looking at the location of the rocker arms you can tell.
If you build up a bottom end with dome'd piston's for a large cam. Those piston's were designed to work with a LS1 style head where the valves are next to each other. And you could possible run into PTV issue's with this head a large cam and a custom LS1 piston.
One of the questions I brought up in one of the Many L92 threads.
Do the Intake Bolt patterns on the L92 match up with the intake bolt patterns from the LS1.
If they do then a bottom plate for a two piece manifold (like the LS2's) could allow the top part of the plenum to be used. It could also mean a F.A.S.T. LSX top plenium could be used with a new LSX bottom plenum that would match up to the new heads.
If the mount bolts and intake port locations are similar then it would mean both GM and aftermarket companies could easily have parts out for the new heads.
If they are completely different then new castings need to be made and new parts... which will drive up the cost.
Just looking for a Yes or No on the Bolt and Intake Port Locations of new L92/L76 heads -vs- locations on the Gen III design (LS1/LS2/LS6/Vortec4800/Vortec5300/Vortec6000)
One of the valves has been relocated (intake or exhaust), I'm not sure which one but just by looking at the location of the rocker arms you can tell.
If you build up a bottom end with dome'd piston's for a large cam. Those piston's were designed to work with a LS1 style head where the valves are next to each other. And you could possible run into PTV issue's with this head a large cam and a custom LS1 piston.
One of the questions I brought up in one of the Many L92 threads.
Do the Intake Bolt patterns on the L92 match up with the intake bolt patterns from the LS1.
If they do then a bottom plate for a two piece manifold (like the LS2's) could allow the top part of the plenum to be used. It could also mean a F.A.S.T. LSX top plenium could be used with a new LSX bottom plenum that would match up to the new heads.
If the mount bolts and intake port locations are similar then it would mean both GM and aftermarket companies could easily have parts out for the new heads.
If they are completely different then new castings need to be made and new parts... which will drive up the cost.
Just looking for a Yes or No on the Bolt and Intake Port Locations of new L92/L76 heads -vs- locations on the Gen III design (LS1/LS2/LS6/Vortec4800/Vortec5300/Vortec6000)
Originally Posted by NO-OPTION-2002
That's how GM typically builds thier engines. That is how your LS1 is built. Even the LS7 still has cast pistons, but with a forged crank.
I don't know that I've ever seen a cast con rod.
I don't know that I've ever seen a cast con rod.
Cast pistons are almost always used for a few key reasons:
Cost
Piston to wall clearance (less cold "slap" and emissions)
production volume (they can make more faster)
Originally Posted by NO-OPTION-2002
Such is the sad state of our industry these days.
At my dealership, all they sell is trucks, the cars just sit there until someone, who can't afford a truck, comes by and gets "shoved" into it. It's kind of pathetic.
At my dealership, all they sell is trucks, the cars just sit there until someone, who can't afford a truck, comes by and gets "shoved" into it. It's kind of pathetic.
Now, if the buying habits of the consumer were to change toward higher performance cars with V8 engines and rear wheel drive, the auto market would be a different place. But that isn't the case. Be glad that there is a need for improved engines on SUV's. Otherwise, the 3.8 L or the Northstar might be the highest performers that GM offers.
Think about it a few minutes.
Steve
